Evangelos Pikasis

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In the present work a photonic integrated circuit (PIC) that emits broadband chaotic signals is employed for ultra-fast generation of true random bit sequences. Chaotic dynamics emerge from a DFB laser, accompanied by a monolithic integrated 1-cm long external cavity (EC) that provides controllable optical feedback. The short length minimizes the existence(More)
The performance of Space-Time Block Codes combined with Discrete MultiTone modulation applied in a Large Core Step-Index POF link is examined theoretically. A comparative study is performed considering several schemes that employ multiple transmitters/receivers and a fiber span of 100 m. The performance enhancement of the higher diversity order(More)
In this dissertation, advanced modulation schemes and digital signal processing techniques are proposed and investigated through both numerical simulations as well as experiments, in order to overcome the limitations of multimode step index plastic optical fibers (SI-POF) to support data rates in the order of Gbps. In particular, novel multi-carrier(More)
The exploitation of optical wireless communication channels in a non-line-of-sight regime is studied for point-to-point and networking configurations considering the use of light-emitting diodes. Two environments with different scattering center densities are considered, assuming operation at 265 nm. The bit error rate performance of both pulsed and(More)
In this paper we describe the design and deployment of a real-time simplex wireless SISO- and MISO-OFDM transmission setup on 5GHz employing two TMS320C6713 DSP Starter Kits (DSKs) as the baseband transmitter and receiver. The baseband system level design is done using Matlab/Simulink and the deployment on the TMS320C6713 DSKs is performed by means of IDE(More)
One of the most critical parameters in free-space optical communications systems operating in a non-line-of-sight regime are the optical losses. In this Letter, we numerically calculate these losses taking into account the scattering effects using the Monte Carlo simulation technique. The obtained results are compared with experimentally obtained data at(More)
Over the recent years many modulation schemes were proposed for laser based high-speed short-range transmission over step-index plastic optical fiber (SI-POF). Among these schemes, CAP and DFT-Spread DMT demonstrated a good performance for intensity modulation direct-detection transmission via SI-POF. In this work, for the first time, we report on the(More)
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